:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --ink: #18202f;
  --muted: #5f6c81;
  --brand: #1d4ed8;
  --brand-dark: #173b93;
  --line: #e5e8f0;
  --soft: #edf3ff;
  --success: #116149;
  --shadow: 0 18px 45px rgba(20, 35, 60, .11);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.site-header {
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(12px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 16px 0 10px;
}
.brand-logo { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 16px;
  background: linear-gradient(135deg, var(--brand), #60a5fa);
  color: #fff; letter-spacing: -.03em; box-shadow: var(--shadow);
}
.logo-text { font-size: 17px; }
.main-nav { display: flex; align-items: center; gap: 18px; font-size: 15px; color: var(--muted); flex-wrap: wrap; justify-content: flex-end; }
.main-nav a:hover { color: var(--brand); }
.search-shell { display: flex; align-items: center; gap: 10px; padding: 0 0 14px; flex-wrap: wrap; }
.search-shell input {
  flex: 1 1 380px; min-width: 220px; border: 1px solid var(--line);
  border-radius: 999px; padding: 12px 18px; background: #fff;
  font-size: 15px; outline: none;
}
.search-shell input:focus { border-color: var(--brand); box-shadow: 0 0 0 4px rgba(29,78,216,.10); }
button, .btn {
  border: none; border-radius: 999px; padding: 12px 20px;
  background: var(--brand); color: #fff; font-weight: 700; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
button:hover, .btn:hover { background: var(--brand-dark); }
.btn.secondary { color: var(--brand); background: var(--soft); }
#fake-search-msg { margin: 0; color: var(--muted); min-height: 20px; font-size: 14px; flex: 1 1 100%; }
.hero {
  position: relative; overflow: hidden;
  padding: 72px 0 42px;
  background:
    radial-gradient(circle at 12% 10%, rgba(96,165,250,.36), transparent 30%),
    linear-gradient(135deg, #f8fbff 0%, #eef5ff 52%, #ffffff 100%);
}
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 36px; align-items: center; }
.eyebrow { color: var(--brand); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; margin: 0 0 14px; }
h1 { font-size: clamp(36px, 6vw, 64px); letter-spacing: -.06em; }
h2 { font-size: clamp(26px, 4vw, 42px); letter-spacing: -.035em; }
h3 { font-size: 22px; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 26px 0; }
.trust-strip {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px;
}
.trust-card {
  background: rgba(255,255,255,.82); border: 1px solid var(--line);
  border-radius: 18px; padding: 16px; box-shadow: 0 10px 30px rgba(20,35,60,.06);
}
.trust-card strong { display: block; font-size: 22px; color: var(--brand); }
.hero-media {
  background: #0f172a; border-radius: 32px; padding: 18px; box-shadow: var(--shadow);
  color: #fff;
}
.video-card { position: relative; overflow: hidden; border-radius: 24px; background: #101828; }
.video-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; opacity: .88; transition: transform .35s ease, opacity .35s ease; }
.video-card:hover img { transform: scale(1.05); opacity: .72; }
.play-button {
  position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%) scale(.9);
  width: 74px; height: 74px; border-radius: 50%;
  background: rgba(255,255,255,.92);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: .25s ease; box-shadow: 0 10px 28px rgba(0,0,0,.2);
}
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.play-button:before {
  content: ""; margin-left: 6px; width: 0; height: 0;
  border-top: 16px solid transparent; border-bottom: 16px solid transparent; border-left: 24px solid var(--brand);
}
.video-meta { display: flex; gap: 14px; flex-wrap: wrap; color: #dbeafe; padding: 14px 4px 2px; font-size: 14px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.tag { background: var(--soft); color: var(--brand); padding: 6px 10px; border-radius: 999px; font-size: 13px; font-weight: 700; }
.section { padding: 70px 0; }
.section.alt { background: #fff; }
.section-head { max-width: 760px; margin-bottom: 30px; }
.section-head p { color: var(--muted); margin: 0; }
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: 0 14px 40px rgba(20,35,60,.06);
}
.card:hover { transform: translateY(-2px); transition: .2s ease; }
.icon {
  width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 14px; background: var(--soft); color: var(--brand); font-weight: 900; margin-bottom: 16px;
}
.card p, .timeline p, .review p, .faq-item p { color: var(--muted); margin: 0; }
.kpi { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 14px; margin-top: 14px; }
.video-grid { grid-template-columns: repeat(3, 1fr); }
.video-teaser { padding: 0; overflow: hidden; }
.video-teaser .content { padding: 18px 20px 22px; }
.scene-card figure { margin: 0; }
.scene-card figcaption { color: var(--muted); font-size: 14px; margin-top: 12px; }
.timeline { position: relative; display: grid; gap: 14px; }
.timeline-item { display: grid; grid-template-columns: 120px 1fr; gap: 18px; align-items: start; }
.timeline-date {
  background: var(--ink); color: #fff; border-radius: 14px; padding: 10px 12px;
  text-align: center; font-weight: 800;
}
.faq-list { display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.review { display: flex; flex-direction: column; gap: 14px; }
.review strong { color: var(--brand); }
.contact-panel {
  background: linear-gradient(135deg, #10214d, #1d4ed8);
  color: #fff; border-radius: 32px; padding: 36px; box-shadow: var(--shadow);
  display: grid; grid-template-columns: 1fr .75fr; gap: 24px; align-items: center;
}
.contact-panel p { color: #dbeafe; }
.contact-list { display: grid; gap: 12px; }
.contact-list div { background: rgba(255,255,255,.11); border: 1px solid rgba(255,255,255,.2); border-radius: 16px; padding: 14px; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.breadcrumb a { color: var(--brand); }
.page-hero { padding: 52px 0 34px; background: linear-gradient(135deg, #fff, #eef5ff); border-bottom: 1px solid var(--line); }
.article {
  background: #fff; border: 1px solid var(--line); border-radius: 26px;
  padding: 32px; box-shadow: var(--shadow);
}
.article ul { padding-left: 20px; }
.article li { margin: 8px 0; }
.site-footer {
  background: #101827; color: #e5e7eb; padding: 46px 0;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 28px; }
.footer-grid a { display: block; color: #dbeafe; margin: 8px 0; }
.footer-grid p { color: #b9c3d5; }
.footer-logo .logo-mark { box-shadow: none; }
@media (max-width: 940px) {
  .hero-grid, .contact-panel, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .video-grid { grid-template-columns: repeat(2, 1fr); }
  .header-inner { align-items: flex-start; flex-direction: column; }
  .main-nav { justify-content: flex-start; }
}
@media (max-width: 620px) {
  .grid-3, .grid-4, .video-grid, .trust-strip { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .timeline-item { grid-template-columns: 1fr; }
  .contact-panel { padding: 24px; border-radius: 24px; }
}